大惊失色 terrified
Explanation
形容非常害怕，脸色都变了。
describes extreme fear, where the facial color changes.
Origin Story
话说唐朝时期，有一位名叫李白的诗人，他游历各地，写下了许多千古名篇。一天，李白来到一座深山，途中遇到了一位老樵夫。老樵夫告诉李白，前面有一座鬼谷，里面住着许多妖怪，十分危险。李白虽然胆子很大，但是听到老樵夫这样说，也不禁大惊失色。他心想，这深山老林的，万一真的遇到妖怪，那可怎么办？想到这里，他不由得加快了脚步，赶紧离开了这座深山。
It is said that during the Tang Dynasty, there was a poet named Li Bai who traveled extensively and wrote many famous poems. One day, Li Bai came to a deep mountain and met an old woodcutter along the way. The old woodcutter told Li Bai that there was a haunted valley ahead, inhabited by many monsters, and was very dangerous. Although Li Bai was very brave, he couldn't help but be terrified when he heard this. He thought to himself, what if I really meet a monster in this deep mountain and old forest? Thinking of this, he couldn't help but quicken his pace and quickly left the deep mountain.
Usage
作谓语、补语；常用来形容人由于极度害怕而脸色大变的样子
as predicate or complement; often used to describe the appearance of a person whose face changes dramatically due to extreme fear
Examples
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听到这个噩耗，他大惊失色，一句话也说不出来。
ting dao zhe ge e hao, ta da jing shi se, yi ju hua ye shuo bu chu lai le.
Hearing the bad news, he was struck with terror and could not utter a word.
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面对突如其来的危险，她大惊失色，手脚都僵住了。
mian dui tu ru qi lai de wei xian, ta da jing shi se, shou jiao dou jiang zhu le.
Faced with the sudden danger, she was terrified, her hands and feet stiff.